RPG: An Investigation of U-Pb Systematics in Conodonts

RPG：牙形刺中 U-Pb 系统学的研究

• 批准号: 9526671
• 负责人: Ellen Martin
• 金额: $ 1.8万
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-05-01 至 1998-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9526671&HistoricalAwards=false
• 关键词: RPG; Investigation; Pb; Systematics; Conodonts

Abstract: The proposed investigation of U-Pb dating of fluor-apatite conodont elements may provide a powerful geologic tool for linking biostratigraphic zones with absolute ages. The combination eliminates the need to interpolate boundary ages from absolute ages derived from sporadically distributed igneous rocks. This interpolation is one of the largest sources of error in current absolute geologic time scales. For the pilot study proposed for this planning grant, the PI will date the stage boundaries in the Early Permian, a time when the nomenclature and stratigraphic positions of stage boundaries are generally agreed upon, and for which the PI can obtain abundant conodonts. If successful, the PI will submit a major proposal to extend the approach into the Late Permian, a time when the stage boundaries and duration of stages are subject to constant debate. Resolution of the Late Permian stratigraphic controversies is of particular interest because the time period includes the most extensive Phanerozoic mass extinction, the lowest sea level stands, the end of the Kiaman Reversed Period, and very rapid apparent rates of change in a number of geochemical parameters. Success of this project will give the PI an important new tool to enhance her existing research, which focuses on the interpretation of global climate change recorded by isotopic variations preserved in marine organisms.

摘要：拟议的氟磷灰石牙形刺元素 U-Pb 测年研究可能为将生物地层带与绝对年龄联系起来提供强大的地质工具。 这种组合消除了从零星分布的火成岩得出的绝对年龄中插值边界年龄的需要。 这种插值是当前绝对地质时间尺度中最大的误差源之一。 对于本次规划拨款提出的试点研究，项目负责人将在早二叠世确定阶段边界的日期，此时阶段边界的命名和地层位置已普遍达成一致，并且项目负责人可以获得丰富的牙形刺。 如果成功，PI 将提交一项重大提案，将该方法扩展到二叠纪晚期，此时阶段边界和阶段持续时间一直受到争论。 晚二叠世地层争议的解决特别令人感兴趣，因为该时期包括最广泛的显生宙大灭绝、最低海平面、凯曼反转期的结束以及许多地球化学参数的快速表观变化率。 该项目的成功将为首席研究员提供一个重要的新工具，以加强她现有的研究，该研究的重点是解释海洋生物中保存的同位素变化记录的全球气候变化。